Use the following information for questions:
When people get married for the first time, the husband is, on average, 2 years older than the wife. The standard deviation of the difference in age is roughly 2.5 years. Suppose it is reasonable to assume that the distribution of the difference in age between the husband and the wife is normal. Twelve recently married couples (all first marriages) are to be selected and the average difference in age is to be calculated.
-What is the mean of the sampling distribution of the sample mean difference in age between the husband and the wife?
A) 0.72
B) 2
C) 2.5
D) 20

Question

Use the following information for questions:
 When people get married for the first time, the husband is, on average, 2 years older than the wife. The standard deviation of the difference in age is roughly 2.5 years. Suppose it is reasonable to assume that the distribution of the difference in age between the husband and the wife is normal. Twelve recently married couples (all first marriages) are to be selected and the average difference in age is to be calculated.
-What is the mean of the sampling distribution of the sample mean difference in age between the husband and the wife?
A) 0.72
B) 2
C) 2.5
D) 20

Quizplus · Accepted Answer

The mean of the sampling distribution of the sample mean is equal to the population mean, which is 2 years.

Use the Following Information for Questions